[ntp:hackers] Need info

Bjorn Gabrielsson bg at lysator.liu.se
Mon Jun 13 13:18:02 PDT 2005


Venu,

There is (presently) a 13 sec offset between GPS time and UTC
time. NTP uses UTC. Are you sure your "GPS Clock" is showing UTC time?  

--

        Björn


"dharmaji venu gopal" <meetvenu58 at rediffmail.com> writes:

>   
>  Dear friends,
>       I am running NTP(ver 4) with a refernce clock( GPS_NMEA driver ).
>  The system is running on Redhat 7.3( 2.4.20-NANO Kernel ). 
>  The reference clock is a GPS Clock which gives output in NMEA format
>  GPGGA/GPGLL at 9600 Baudrate. So I modified the ref_nmea.c which 
>  normally works at 4800 Baudrate.
> 
>  To see the system offset I did ntpq -p. Even though the offset is 
>  below 10 usec ( as shown by ntpq ), the system time(shown by xclock )
>  is lagging by almost 15 sec to GPS Time ( shown by GPS Clock ).
> 
>  The ntp.conf file contains configuration for "127.127.20.1" (mode 2) 
>  with PPSAPI enabled and nothing is mentioned abt local clock. The 
>  system time zone is set to GMT.
> 
>  I just want to know if there's any problem in the setup/configuration.
> 
>  Regards,
>  venu. 
>  
>    
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